PCI: PCI_QUIRKS depends on PCI

commit 3d137310 ("PCI: allow quirks to be
compiled out") introduced CONFIG_PCI_QUIRKS, which now shows up in each
and every .config.  Fix this by making it depend on PCI.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>